cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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sdram.S (3078B)

      1/* SPDX-License-Identifier: GPL-2.0
      2 *
      3 * MS7724SE sdram self/auto-refresh setup code
      4 *
      5 *  Copyright (C) 2009 Magnus Damm
      6 */
      7
      8#include <linux/sys.h>
      9#include <linux/errno.h>
     10#include <linux/linkage.h>
     11#include <asm/asm-offsets.h>
     12#include <asm/suspend.h>
     13#include <asm/romimage-macros.h>
     14
     15/* code to enter and leave self-refresh. must be self-contained.
     16 * this code will be copied to on-chip memory and executed from there.
     17 */
     18	.balign 4
     19ENTRY(ms7724se_sdram_enter_start)
     20
     21	/* DBSC: put memory in self-refresh mode */
     22
     23	ED 0xFD000010, 0x00000000 /* DBEN */
     24	ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
     25	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
     26	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
     27	ED 0xFD000040, 0x00000001 /* DBRFPDN0 */
     28
     29	rts
     30	 nop
     31
     32ENTRY(ms7724se_sdram_enter_end)
     33
     34	.balign 4
     35ENTRY(ms7724se_sdram_leave_start)
     36
     37	/* DBSC: put memory in auto-refresh mode */
     38
     39	mov.l	@(SH_SLEEP_MODE, r5), r0
     40	tst	#SUSP_SH_RSTANDBY, r0
     41	bf	resume_rstandby
     42
     43	ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
     44	WAIT 1
     45	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
     46	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
     47	ED 0xFD000010, 0x00000001 /* DBEN */
     48	ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
     49
     50	rts
     51	 nop
     52
     53resume_rstandby:
     54
     55	/* CPG: setup clocks before restarting external memory */
     56
     57	ED 0xA4150024, 0x00004000 /* PLLCR */
     58
     59	mov.l	FRQCRA,r0
     60	mov.l	@r0,r3
     61	mov.l	KICK,r1
     62	or	r1, r3
     63	mov.l	r3, @r0
     64
     65	mov.l	LSTATS,r0
     66	mov	#1,r1
     67WAIT_LSTATS:
     68	mov.l	@r0,r3
     69	tst	r1,r3
     70	bf	WAIT_LSTATS
     71
     72	/* DBSC: re-initialize and put in auto-refresh */
     73
     74	ED 0xFD000108, 0x00000181 /* DBPDCNT0 */
     75	ED 0xFD000020, 0x015B0002 /* DBCONF */
     76	ED 0xFD000030, 0x03071502 /* DBTR0 */
     77	ED 0xFD000034, 0x02020102 /* DBTR1 */
     78	ED 0xFD000038, 0x01090405 /* DBTR2 */
     79	ED 0xFD00003C, 0x00000002 /* DBTR3 */
     80	ED 0xFD000008, 0x00000005 /* DBKIND */
     81	ED 0xFD000040, 0x00000001 /* DBRFPDN0 */
     82	ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
     83	ED 0xFD000018, 0x00000001 /* DBCKECNT */
     84
     85	mov	#100,r0
     86WAIT_400NS:
     87	dt	r0
     88	bf	WAIT_400NS
     89
     90	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
     91	ED 0xFD000060, 0x00020000 /* DBMRCNT (EMR2) */
     92	ED 0xFD000060, 0x00030000 /* DBMRCNT (EMR3) */
     93	ED 0xFD000060, 0x00010004 /* DBMRCNT (EMR) */
     94	ED 0xFD000060, 0x00000532 /* DBMRCNT (MRS) */
     95	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
     96	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
     97	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
     98	ED 0xFD000060, 0x00000432 /* DBMRCNT (MRS) */
     99	ED 0xFD000060, 0x000103c0 /* DBMRCNT (EMR) */
    100	ED 0xFD000060, 0x00010040 /* DBMRCNT (EMR) */
    101
    102	mov	#100,r0
    103WAIT_400NS_2:
    104	dt	r0
    105	bf	WAIT_400NS_2
    106
    107	ED 0xFD000010, 0x00000001 /* DBEN */
    108	ED 0xFD000044, 0x0000050f /* DBRFPDN1 */
    109	ED 0xFD000048, 0x236800e6 /* DBRFPDN2 */
    110
    111	mov.l	DUMMY,r0
    112	mov.l	@r0, r1 /* force single dummy read */
    113
    114	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
    115	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
    116	ED 0xFD000108, 0x00000080 /* DBPDCNT0 */
    117	ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
    118
    119	rts
    120	 nop
    121
    122	.balign 4
    123DUMMY:	.long	0xac400000
    124FRQCRA:	.long	0xa4150000
    125KICK:	.long	0x80000000
    126LSTATS:	.long	0xa4150060
    127
    128ENTRY(ms7724se_sdram_leave_end)